Bar-heating furnace



Sept. 3, 1929. v F. w. BROOKE .BAR HEATING FURNACE Filed April 14, 1926 5 Sheets- Sheet W/TNESSE 6 Sept. 3, 1929. F. w. BROOKE BAR HEATING FURNACE Filed April 14, 1926 3 Sheets-Sheet s .R o a w WB M v M G T Mu Fm H mm bm aw Sept. 3, I929.- F. w. BROOKE BAR HEATING FURNACE Filed April 14, 1926 3 Shets-Sheet 3 I M r nMu W5 WNW a 173 y mi W Patented Sept; 3, 1929.

UNITED STATES PATENT OFFICE.

FRANK W. BROOKE, OF PITTSBURGH, YENNSYLVANIA.

nan-r rnArfne FURNACE.

Application filed April 14, 1926. Serial No. 101,927.

It is the object of the invention to provide a furnace for heating bars, ,slabs or billets for rolling, in which the heat will be utilized P zontal plane 'of the line 11-11 of Figure 1.

Figure 3 is across-section on the line III III of Figure 1, and Figure 4 is a cross-section on the line IVIV of Figure 1.

The furnace is shown in the drawingsas provided with a combustion-chamber 1 for heating by means of coal, using a standard form of stoker, the flame and products of combustion flowing over the bridge-wall 2 into the heating-chamber 3, and thence through the heating-chamber and out through the fines 4, 4, at the opposite or rear end of the heating-chamber, and into the stack-flues 5. But the character of fuel em 'ployed and the manner of its introduction into the heating-chamber are not material to the invention. I

The bars or billets being heated are caused to pass through the heating-chamber 3 on ways which are elevated above the floor 6 of the chamber, with the space beneath the ways in open communication with the body of the chamberv These ways preferably consist of,hollow water-cooled skid-pipes 7 of surfaces of blocks 8 mounted on pedestals 9 arranged at intervals in rows longitudinally of the. chamber. Thus a pair of the longitudinal skid-pipes 7 constitutes a track through the chamber for the bars or billets. It is also preferred that the primary skidpipes 7 shall terminate within the chamber at a point somewhat beyond its longitudinal center, and that the length of the. track shall be completed by another pair of supplemental skid-pipes 7, thus facilitating the removal and replacement of a damaged'or worn section of the,track. In Figure 1 of the drawings the major ortion of the track, consisting of the skid-pipes" 7, is horizontal;

well known form which are laid in the top while the terminal portion, consisting of the skid-pipes 7 is inclined upwardly toward the rear end of the chamber, this arrangementb'eing considered of advantage, though not essential, in the so-called pair-heating of bars as shown, which are arranged on the track transversely of the chamber. and

standing on their longitudinal edges with their flat faces contacting with adjacent bars. If desired the bars can be Withdrawn or' discharged through a suitable opening through the rear end-wall 10 of the furnace, but it is preferred in the pair-heating furnace shown to provide the discharge-opening 11, having the door 12, in the side-wall of the furnace adjacent to the end-wall. v

In the heating-chamber the space 13 underneath the bars on the track is in open communication with the body of the heating-chamber through the openings 14 be-. tween the pedestals 9. In order to draw active currentsof the heated products of combustionaround and underneath the'bars, flue-ports 15 are formed in the floor 6 of the chamber beneath the track and are connected to a flue 16 underneath the floor, thelatter opening into the stack-flue 5. Thus not only is there always maintained the main current of the products of combustion above the bars from the front to the rear of the heating chamber, but commencing at v the front of the chamber and throughout its length active currents of high heat intensity are caused tQflOW down around and beneath the bars, thus subjecting the bars equally on all exposed surfaces. and throughout their travel, to. immersion in an active homogeneous bath of heat of substantially equal intensity in any given cross-sectional zone taken transversely of the heating-chamber.

The bars are thus effectively heated with the 1 maximum uniformity attainable in furnaces of this type.

For controlling in a measurethe How of o the currents of heated products, the ports15 may be individually provided with dampers -17, having operating rods 18 passing through the furnace structure. as shown in Figure 3.

The bars are charged into the furnace, in' the relative arrangement show'n and above pointed out, through the opening 20 in the front end-wall 21, provided with a vertically sliding door 22. The reciprocable pusher or charging-head 23 may be operated by any suitable means, various types of which are welLknown, but it is preferred to employ for that purpose the improved mechanism shown in the drawings.

The motor 24, through the pinion on its armature shaft, drives the toothed wheel 26, 'having on its shaft-,2? the worm 28. The worm 28 meshes with the worm-wheel 29, having on its shaft 30 the oppositepinions 3l,'which respectively mesh with and drive the opposite toothed. wheels 32. Outside the wheels 32 are pivoted the lower ends of rocker arms 33, the upper ends of which are respectively connected by links 34, witli the opposite ends of the head 23, and mediately'. connected by links 36 with crank-pins 37 carried by the wheels 32. Thus the motor 24, while running-in one direction, operates through the described connections to cause the reciprocation of the head 23 into and away from the furnace- 1 'opening 20', in a predetermined range of movement. The reversals ofthe movement of the head 23 being thus accomplished automatically, the usual stops and reversing switches are done away with.

For retaining the row of bars in place in the heating-chamber and preventing. them from falling backwardly there is provided a suitable latch or support which is preferably automatic in operation. The preferred latch, which is believed to be new, and-which is a part of the present invention, comprises a head 38 mounted on the "inwardly and is pivoted mediallg outer end of the bent arm 39, which projects at 40 underneath the heating-chamber. weight 41 is carried on the inner endof the-arm,

and the head .38 works through a slot or recess 42 in the sole-plate 43. The-inner face of the head 38 is shaped to support the bars in upright or other desired position, and its body .portion slopes outwardlyand downwardlyjn; an inclined outer face 44. When the bars are pushed into the furnace the head 38 is caused to move downwardly and outwardlyon the pivot 40 as acenter andibelow the. face of the sole-plates 43,

' and it is held down until the outermost bar I has passed the apex of the inclined face 44. ,Ychamber having a floor, a fuel-inlet at one Then as the pusher-head 23 "is withdrawn, the weight 41 causes the upward and inward movement of the bar-supporting :head 38 into supporting contact with the rear face 38 were moved in ajvertical path.

The lower edge of. the door 22 has afslo 45 of suitableform to fit thehead 38, so tha I claim as myinvention:

the front opening 20 of the furnace may be kept entirely closed except only during the charging of; the bars.

It will be understood that the present invention, in part at least, may be employed in furnaces for heatingbillets, slabs and other metalli bodies, as well as what are known technically as sheet-bars. Therefore the appended claims are directed to furnaces for heating bodies of metal which may be generically called bars, and of -'various forms .and bulk. 5

1. In a bar-heating furnace, a heatin chamber having a fuel'inlet at one end an an outlet for the products of combustionat its opposite end, a bar support elevated above the floor of the chamber and extending from end to end thereof with thespace beneath said support in lateral communication with the body. of the chamber, and a series of outlet ports opening through the floor of the chamber beneath the bar suport. P 2. In a bar-heating furnace, a heating chamber having a fuel inlet at one end and an outlet for the products of'combustion at its opposite end, a bar support elevated above the floor of the chamber and extending from end to end thereof with-the space beneath said support: in lateral communication with the body of'the chamber, a series of outlet ports opening through the floor of the chamber beneath the bar support,

bar support elevated above the floor of the chamber and extending from the fuel-inlet end to the opposite. end thereof with the space beneath said support in lateral communication with the body of the chamber, I

and a series of outlet ports opening through the floor of the chamber beneath the bar support. V

4. In a bar-heating-furnace, a heating end" of the chamber and an. outlet forpthe products of combustion at its opposite end, a track elevated above the floor of the chamber and extending from end to end thereof with the space beneath said track in lateral communication with the body of the chamber, a flue beneath the'floor of the chamber,

& as ing through the floor of the chamber be- 7 would take place, for instance, ifthe head neath, the track and connectedto said ,flue. In testimony whereofI have hereunto set yhand.

. r I FRANK W- BROOKE.

and a series ofQ-outlet ports open- 

